Land vehicles: bodies and tops – Bodies – Structural detail
Patent
1995-04-28
1996-11-26
Mitchell, David M.
Land vehicles: bodies and tops
Bodies
Structural detail
49 41, 49449, 180 8912, 292DIG46, 2961469, 296207, B60J 506
Patent
active
055777953
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an operator cab of a construction machine and, more particularly, an operator cab of a construction machine such as a hydraulic excavating machine provided with a swivel body.
RELATED BACKGROUND ART
A side view of a conventional hydraulic excavating machine, having a swivel base 22 on a crawler 21, is shown in FIG. 9. This swivel base 22 is equipped with an operator cab 23, an engine compartment 24 and a collapsible working machine 25. The operator cab 23 on such hydraulic excavating machine is installed off-center with respect to the center O of the swivel base 22, as shown in FIGS. 10 and 11. A hinge type door 26 of the operator cab 23, for an operator to access the inside of the operator cab 23, is opened by pivoting the door 26 to a fully-opened position as shown with a 2-dotted broken line in FIG. 10. A slide type door 26 is opened by sliding it to a fully-opened position as shown with the 2-dotted broken line in FIG. 11.
However, if the opening for the hinge type door is large-sized, it presents the problem that the door protrudes beyond the turning radius R of the upper swivel body when the door is kept open and fixed, and can therefore be damaged due to collision or bumping with other external objects during a swiveling operation.
In the case of the slide type door, the rails and rollers employed to slide the door occupy space within the operator cab, and therefore the internal space of the operator cab is reduced. As the construction machine is generally operated with its door kept open in summer, there is a problem in that it is difficult to fix the door without any play when it is kept open, since there is inevitably some play in the mechanism of such slide type door.
SUMMARY OF THE INVENTION
An object of the present invention made to solve the above-described problems is to provide an operator cab of a construction machine capable of preventing protrusion of the door beyond the turning radius when the door is to be kept open, by appropriately determining the size of the door opening, and simultaneously securing the door without play when the door is kept either fully opened or closed, while maintaining a larger indoor space.
According to the present invention, an outer side surface of a side wall of the operator cab, located at an opposite side to a boom of a working machine mounted on a swivel base, is formed to be convex, including the door; rails are provided inside this side wall of the operator cab; and the door is provided with rollers, which are always engaged with the rails, to slide the door for freely opening and closing the door; and the position of the door, when it is locked open, is set to be along the outer surface of the side wall of the operator cab and within the turning radius of the swivel base. Specifically, an upper rail is installed at an internal upper part of the outer side wall of the operator cab, a lower rail at an internal lower part of the outer side wall, and a center rail at an outside center of the outer side wall, respectively, and the door is provided with the upper roller, lower roller, and center roller which are always engaged with these rails to slide the door for freely opening and closing the door.
Male and female strikers, which engage with each other when the door is fully opened or closed, are provided between the outer side wall of the operator cab and the door.
According to the construction described above, the door can be opened and closed with the rollers which move on the rails since the rollers are engaged with the rails provided inside the operator cab, and any unexpected contact with external obstructive objects can be avoided even during swiveling operation since the position of the fully opened door remains within the turning radius of the swivel base. The male and female strikers ensure firm fixing of the door without play, even when it is fully opened or closed, because the strikers engage with each other in either of these positions of the door.
BRIEF DESCRIPTION OF THE DRAW
REFERENCES:
patent: 1919387 (1933-07-01), Stringer
patent: 4869544 (1989-09-01), Anwyll et al.
patent: 4991905 (1991-02-01), Watanabe et al.
Kabushiki Kaisha Komatsu Seisakusho
Mitchell David M.
Robinson Kia M.
LandOfFree
Operator cab door of construction machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Operator cab door of construction machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Operator cab door of construction machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1967740